Is that a cherry? Yes, it is. No, it isn't.
①要有批判的精神
②要敢于反对、否定老师
③要敢于质疑，树立创新精神
④尽信书，则不如无书
图中的两个四边形相似，则 =____°，a=____°．
- Alan, don't ________ too late, or you will feel sleepy in class.
- Sorry, Mrs. Black. I won't do that again.
=4，AE交BD于F，
=（ 
）
2SO3为放热反应，对该反应的下列说法中正确的是
=